6. Configuration

First: Please run the xf86config program to create a correct
configuration.

You can turn off hardware cursor by inserting the following line in the
Device section of the XF86Config file:

Option "SWcursor"

Or turn off hardware acceleration:

Option "noaccel"

Or turn off MMIO

Option "nolinear"

Please don't specify the amount of video RAM you have or which chipset
you have in the config file, let the driver probe for this. Also please
don't put any "clocks" line in the device section since these chips have
a fully programmable clock that can take (almost) any modeline you throw
at it. It might fail at some specific clock values but you should just
try a slightly different clock and it should work.